elasticsearch/docs/reference/query-languages/esql/_snippets/functions/description/atan.md

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% This is generated by ESQL's AbstractFunctionTestCase. Do not edit it. See ../README.md for how to regenerate it.
**Description**
Returns the [arctangent](https://en.wikipedia.org/wiki/Inverse_trigonometric_functions) of the input numeric expression as an angle, expressed in radians.